It appears from the amount of subduction and upthrust around the world that the Earth's circumference has changed. It's an arcane phenomenon called circumferential shortening.
Circumferential Shortening
Radial Shrinkage
It will help to have an idea of the volume of material in the Earth's mantle because it appears that Earth has shrunk since it was first created, a process known as radial shrinkage.
Hell with Benefits
There are benefits to hell being at the center of the Earth. It solves the problem of exponential nuclear decay and renders radiometric dating useless for the development of an ancient Earth narrative.
Mantle Collapse
If you use the Bible to deduce something and conclude that there needs to be something else in the Bible to confirm it, you search the Bible to find what you deduced was needed. If you find it, you're on the right track.
Hell is Consuming the Earth
The lowest hell is the core of the Earth which was kindled when God cursed the Earth. It's been consuming the Earth ever since then. The Earth is melting from the inside out.
September 8th
The fire kindled in the lowest hell consumed the core of the Earth. The core melted completely so that the pillars of the Earth lost their base of support. The mantle collapsed.